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Coarse and Fine-Grained Aspects of Gravitational Entropy

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Astrophysics, Cosmology, and Black Holes".

Deadline for manuscript submissions: closed (31 August 2025) | Viewed by 900

Special Issue Editors


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Guest Editor
Instituto de Física Teórica UAM/CSIC, Calle Nicolás Cabrera 13-15, 28049 Madrid, Spain
Interests: string theory; quantum gravity; holography; quantum information theory; black hole physics

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Guest Editor
Department of Mathematics, King’s College London, London WC2R 2LS, UK
Interests: gravitational holography, entanglement entropy, and complexity; quantum gravity; braneworld holography

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Guest Editor
Institute for Mathematics, Astrophysics and Particle Physics, Radboud Center for Natural Philosophy, Radboud University, 6525 AJ Nijmegen, The Netherlands
Interests: theoretical physics; gravity; black holes; holography

Special Issue Information

Dear Colleagues,

Gravitational entropy remains one of the most intriguing and fruitful topics in modern theoretical physics, lying at the interface of quantum mechanics, gravity, thermodynamics, information theory, and condensed matter physics. This proposed Special Issue aims to explore the coarse and fine-grained aspects of gravitational entropy, fostering dialogue across diverse subfields of research. By bringing together leading experts, we seek to present a comprehensive collection of articles that enhance our understanding of gravitational entropy in its various forms, emphasizing both foundational approaches and recent advances.

The Special Issue will cover a broad range of topics, including, but not limited to, the following:

  1. Black hole thermodynamics and beyond;
  2. Extremal and near-extremal black holes;
  3. Hawking radiation and the island formula;
  4. Entropy inequalities and covariant entropy bounds;
  5. Entropic origins of gravity;
  6. Bit threads and holographic entanglement entropy;
  7. Alternative measures of entropy in holography;
  8. Algebraic approach to entropy;
  9. Quantum reference frames and edge modes;
  10. Stringy models and microstate counting.

The Special Issue aims to

  • Foster interdisciplinary collaboration among researchers working on gravitational entropy across various theoretical frameworks;
  • Highlight recent advances and ongoing debates in the field, especially concerning the interplay between quantum mechanics and gravity;
  • Provide a comprehensive resource that can serve as a reference for students and researchers interested in the multifaceted landscape of gravitational entropy.

By addressing both coarse and fine-grained aspects of gravitational entropy, this Special Issue will contribute significantly to the discourse surrounding one of the most fundamental questions in theoretical physics: how do we understand the nature of entropy in a gravitational context? We invite submissions from researchers worldwide to enrich this dialogue and advance our collective understanding of gravitational entropy.

Dr. Juan F. Pedraza
Dr. Andrew Svesko
Dr. Manus R. Visser
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gravitational entropy
  • black hole thermodynamics
  • entanglement entropy
  • entropy in holography

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Published Papers (1 paper)

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Research

17 pages, 386 KB  
Article
A Horizon-as-Apparatus Model That Reproduces Black Hole Thermodynamics
by Daegene Song
Entropy 2025, 27(8), 859; https://doi.org/10.3390/e27080859 - 14 Aug 2025
Viewed by 556
Abstract
We present a measurement-driven model in which the black hole horizon functions as a classical apparatus, with Planck-scale patches acting as detectors for quantum field modes. This approach reproduces the Bekenstein–Hawking area law SBH=A4p2 and provides [...] Read more.
We present a measurement-driven model in which the black hole horizon functions as a classical apparatus, with Planck-scale patches acting as detectors for quantum field modes. This approach reproduces the Bekenstein–Hawking area law SBH=A4p2 and provides a concrete statistical interpretation of the 1/4 factor, while adhering to established principles rather than deriving the entropy anew from first principles. Each patch generates a thermal ensemble (∼0.25 nat per mode), and summing over area-scaling patches yields the total entropy. Quantum simulations incorporating a realistic Hawking spectrum produce Sk=0.257 nat (3% above 0.25 nat), and we outline testable predictions for analogue systems. Our main contribution is the horizon-as-apparatus mechanism and its information-theoretic bookkeeping. Full article
(This article belongs to the Special Issue Coarse and Fine-Grained Aspects of Gravitational Entropy)
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